像往常一样,上面的示例代码都托管在 GitHub。 欢迎关注知乎专栏《跟上Java8》,分享优秀的Java8中文指南、教程,同时欢迎投稿高质量的文章。 原文:Avoid Null Checks in Java 8 译者:ostatsu 来源:在Java 8 中避免 Null 检查 编辑于 2018-01-26 15:39 Java 8 Java EE Java 编程 赞同243 条评论...
原文:https://winterbe.com/posts/2015/03/15/avoid-null-checks-in-java/ 译文:https://www.oschina.net/translate/avoid-null-checks-in-java 原文作者:Benjamin 译文作者:ostatsu
In the real world, programmers find it hard to identify which objects can benull.An aggressively safe strategy could be to checknullfor every object. However, this causes a lot of redundantnullchecks and makes our code less readable. In the next few sections, we’ll go through some of the...
In this example, the String variable str is initialized to null. The if statement checks if str is null and prints a message accordingly. Example 2: Null Check Before Method Call public class NullCheckExample { public static void main(String[] args) { String str = null; if (str != nul...
It simply checks for the null reference of the input String object. If the input object is null, it returns an empty (“”) String, otherwise, it returns the same String: return value == null ? "" : value; However, as we know, String objects are immutable in Java. That means, ...
Lombok @NotNull Annotation is used to generate not null checks that can prevent execution butonly in Runtime.So it doesn't fit our purpose.Shortly, this annotation does the next thing: Checker Framework @NonNull @Nullable Annotations Processors ...
Efficiency: The isEmpty() method internally checks the length of the string, resulting in efficient execution. However, there are a few considerations to keep in mind: Null strings: The isEmpty() method does not handle null strings. If there is a possibility of encountering null strings, it...
Java语言里所有其它语法结构都不会因为null值而隐含抛NPE的语义。当然,用户可以在自己需要的地方显式检查null值然后自己抛出NPE,就像: java.util.Objects.requireNonNull(Object)/** * Checks that the specified object reference is not {@codenull}. This ...
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Before opening an issue,@davidalayachewI recommend changing allthrow new NullPointerException();inConcurrentHashMapto be (Objects static import)requireNonNull, and ensurerequireNonNullare on distinct lines. This way we can deduce the null argument from the line number. What do you think?